[mabarker1]

That's great if One can read this: このアドオンについて カスタムボタンに再起動ボタンを追加します． アドオン開発中などに出しておくと便利です．

[W.]

"Restart button adds custom button for this add-on. It is useful in Add-on development and to put..."

I know, me no read-y Japanee either, but the button works, and it's from Mozilla's selection. I've got a bunch of them and have only found a couple stinkers I ditched quick for being crashy. The ability to customize browsers is great and they are a far cry from what they were 20 years back! Browser emulator!